fix(tbm): "내 TBM 아님" 근본 수정 — currentUser 로드 + id 호환

- tbm-mobile.js: localStorage('sso_user') → getCurrentUser() 전환
- isMySession: currentUser.id도 비교 (tkfb-core가 id만 설정)
- tbm-create.js: leaderId fallback (allWorkers 미로드 대응 + String 비교)
- 마이그레이션: NULL leader_user_id → created_by로 복구

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

system1-factory/api/db/migrations/20260331_fix_deduct_days_precision.sql

@@ -30,3 +30,5 @@ INSERT IGNORE INTO company_holidays (holiday_date, holiday_name, holiday_type, c
 INSERT IGNORE INTO company_holidays (holiday_date, holiday_name, holiday_type, created_by) VALUES ('2026-10-03', '개천절', 'PAID', 1);
 INSERT IGNORE INTO company_holidays (holiday_date, holiday_name, holiday_type, created_by) VALUES ('2026-10-09', '한글날', 'PAID', 1);
 INSERT IGNORE INTO company_holidays (holiday_date, holiday_name, holiday_type, created_by) VALUES ('2026-12-25', '크리스마스', 'PAID', 1);
+-- NULL leader_user_id 복구 (created_by로 채움)
+UPDATE tbm_sessions SET leader_user_id = created_by WHERE leader_user_id IS NULL;